You currently have javascript disabled. Several functions may not work. Please re-enable javascript to access full functionality.

Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!

Say hello and join the conversation

Subscribe to topics and forums to get automatic updates

Get your own profile and make new friends

Classifieds with all sorts of Subaru goodies

Photo hosting in our gallery

Meet other cool people with cool cars

Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning** Not an actual guarantee, but seriously, you probably won't regret it!

According to the '74 service manual, you have a vent on your fuel cap and just one hose to the intake with one little overflow bucket or something in the path.

For some reason, my car has a "wagon" setup in terms of the ventilation. Although mine doesn't have the fuel cap vent, its actually a different fuel cap all together so its hard to find one (I didn't want to drill it for that reason).

Kosta, i doubt that the fuel cap actually seals the tank 100% so run the system as you said but check to see if the fuel pump shuts down when it gets to pressure, but if the carb has an overflow pipe, route that back to the inlet side of the filter
Cheers Thierry

The carb doesn't have an overflow pipe. I have seen other IDF's with overflows, but those were only ones that were equipped on specific vehicles from the factory. The carbs themselves aren't sold with them.

Anyway, my crown jewel is ready to go, just waiting on cylinder heads to come back from the shop!

I have all the FSM's. The "overflow limiter" is on the later cars instead of the little valve thing that is on the FF-1, which I obviously can't replicate properly. But with one of the limiters from the later cars, I can duplicate the system from those cars and it should work fine.

I think its just a two way valve. If I can figure out exactly what it is, maybe I can get something similar from Napa/Kragen/etc.?